1966 20HP Johnson

This topic has 27 replies, 9 voices, and was last updated 3 years, 6 months ago by Evinrude 25.

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September 26, 2020 at 4:01 pm #217339
aquasonic
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Are the coil shoes flush with the cut out on the mounting boss just under them? A picture would be very helpful.
September 27, 2020 at 10:33 am #217397
squierka39
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When you set the point gap was it way off from before? Using a multimeter and the pointer tool I assume? I have had the same problem in the past, just kept at it till it worked. I’ve never really figured out why it does it though. Just make sure everything you’ve worked on is tight and seated properly. It will be something simple.
September 27, 2020 at 10:48 am #217398
Mumbles
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It sounds as if the black wires coming from the condensers haven’t been folded over and are contacting the flywheel. Can you pull the flywheel and post a photo of the mag plate?
September 28, 2020 at 11:19 am #217465
Evinrude 25
Participant
Hello all,
I found a problem and temperately fixed it. It turned out the Cam #316583 cracked so it threw the timing off when tightened. So I did a trial and error method to get the right timing when torqued down to 40 ft.lb. I got sparks of both cylinder and got the motor run. The crack where about is shown at the red mark in the picture. Now I am looking to find a replacement cam for it.
- This reply was modified 3 years, 6 months ago by Mumbles.
September 28, 2020 at 11:23 am #217468
Evinrude 25
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I could not find 0316583 but there other number 0510168 comes up. Is 0510168 could be used ?
September 28, 2020 at 3:57 pm #217487
aquasonic
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I never would have guessed. Never heard of that happening, but good observation on your part. I wonder if something prevented it from seating properly, and it cracked when the flywheel was torqued?

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fleetwin
September 28, 2020 at 4:29 pm #217491
Evinrude 25
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Yes, It was cracked when I torqued.
September 28, 2020 at 5:38 pm #217501
fleetwin
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US Member - 2 Years
Well, that would certainly explain this issue! Great job pinning down this mystery…
September 28, 2020 at 7:00 pm #217505
bobw
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Evinrude 25 wrote:

I could not find 0316583 but there other number 0510168 comes up. Is 0510168 could be used ?

510168 was the originally specified cam and was commonly used on many OMC motors. It was replaced by the 316583 but I know of no reason why the 510168 wouldn’t work.

Bob

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1957 Evinrude Fastwin 18
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20

“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."
September 29, 2020 at 11:19 am #217547
cajuncook1
Participant
Two things that come to mind that could have caused points cam to crack.

– the points cam was not completely seated prior to tightening/torquing the flywheel. The key may be damaged or malaligned preventing the points cam from properly seating and as the flywheel was being tightened it pushed the cam down and cracked it in the process.

– In the past the flywheel may have been over tightened/torqued and slightly mushroomed the flywheel mating surface. This would cause the flywheel to press on the points cam and crack it.

Regardless the issue, please inspect the above possible issues, so the replacement points cam is not cracked as well.

Cheers,
Cajun
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